Graduation Cap

this is new to me and I want to make cookie pops for favors..to decorate a cap would i line the cap with the same color i use for flooding and then outline the cap in yellow..or could I outline cap in yellow..flood it n blue.

Do you want the blue cap to be outlined in yellow? If you outline in a different color than you flood with, you'll want it to dry completely so the colors don't bleed. If you want it to be all blue, you don't have to wait so long to flood. Good luck.

I think since I am new to this I will outline first in blue then flood in blue..so from what I read the flood icing should be thinner than the piping icing..so I guess I would pipe all my cookies then thin the icing down to flood. can I do this in the pastry bag..

Yes, you will need to thin the flood icing down quite a bit. Here is a link that explains. You can use a pastry bag, but make sure there is no grease in it. I keep separate pastry bags for royal or color flow and do not use with buttercream.